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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6824049e7dab3c0486ff397e8be7f32c3a4bcedc4b27e4aedf2b0e2b3fee112e' 
  AND token = 'oTtnvRcZw5MypE2BNSUaEcWKWrlYu7zwP/hI7gP797Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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