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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c7ba4808c9abedc40e005f554a0e34ea13572577ac9fc648cd24517ab3e159' 
  AND token = 'J5dyHsvI1WpT/picgU8EVqvEzWm+FNDws0h7F2NgHPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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