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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37dee9488b32fdb3f5fd3266a6a8c4ded5ddbfe25a312d6352895c8870f3f2d' 
  AND token = 'o6NmECxG+AZVR6WqJx1yEYw0SziSp1dr9yq8i9qFhlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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