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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6743d9ea7bbc72058e465824fb9fd9e2bcc5eda62861a52bb3c30fff6617f7' 
  AND token = 'pBzS5sYa5qk8ebnaxLoFgzx8tJcm95pU1hNAJd1eNtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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