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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '583156b1d8d4fd6803a85031cf2e8322e261474d65ba4ad7515588759d313661' 
  AND token = 'XQsZv4zIvAjMAZFp3MRbpBcZIxim8Zk+HEZr0LZAPVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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