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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c473d586133fbd1c0ecc2ccc0737d43c5a0c59a08b27c27b42e292cde35bdce2' 
  AND token = 'yb9shxCKShyZhV01mQiXLMBW9KO+/lmQlnsspXV+7b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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