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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efbadfd5d8f2fd1f4f546bfcf87867cce93f6d7ff6c9ececaa69c6fd0a95bef3' 
  AND token = 'BjzmNFt0Tt12TI9N+hzhngz8rb0tW+twTIKWwxiCLsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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