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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad716f44045042ed13de9814830510c97e60b6e4e100ec930d5ea7235d6a76d' 
  AND token = 'o0N1+gcNfjTlyPDU7xWz6bngeSV4ySEQqgIB0wf077w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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