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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998eb4cd83d8002fffa4661d9e54065a97f05639e61b7c074e816a7c74453e8c' 
  AND token = 'b33lilo9+dJqIZm2/fPhzEpzeHj7X7fFLg2H2yEaQ3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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