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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c25a5b1a4bba30f397147759d73ce23c7a56ab60262a7b0e0366fa182c60e80c' 
  AND token = 'ZG1LRIg2UbeVhdBRXLsJ4JEQ8E15ZY0RWzL2IsDdxnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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