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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5ffac3d4451608d8f87b443b71df77429634f5508766a3c378e84a11281761' 
  AND token = 'xCwIXnTNHfOFlp7EEFHhWyaUU0sPHdqb+/eiApnxwv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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