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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f617c261f7c5eb16b25fa4ffe7d156fa190d5df8ee718d2c8ee3fa3a2e8d01' 
  AND token = 'ULnckRF3MCiX69wwQnTB2iACiKYKH7j7u6C06XFekiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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