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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ac76041b2f4c22067a627c93eab5cbddef2319bacac69daf19bdcb205c9e93' 
  AND token = '7sxx+O84M+/m4VjXk9aPDeU56eUN4VWyXGEvzmd8beI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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