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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f75b48189af4f498895f0823843e1db24fb29da09061e406b9c639bcc4abab2c' 
  AND token = 'p4o9Tt3b6SUrF5ANH9mPHfO+JUn4VUkq5l5/OWm1Y0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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