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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d94e2a4d3bec2df251696be1b28f3bfd941c8522c63130020097cc6d40cac9' 
  AND token = 'ku4Kjqxr9gVI9/Bl1/4AqFePys+zSEWFVlptY8rgK9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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