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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9def7ad990e3a9ca14583b2a8b98cc4545f96677ae4603a2197d3a8a0f8697' 
  AND token = 'ktNP5SdjybvkbLxtwIx9QGHmTOPFosD1VS3W1Afo5os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}