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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3a1c4bdd3bda348fc1df8e6f1b77a07c6bc6b210b8874456ec5bb21db5313f' 
  AND token = '5/1jVJpimZwL+dv40TqNd3MUhrulQ11/6DZJc8Q4blg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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