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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7707ab1566c4475db63523a35509019926554b6b2adc0397ef7f7e557f6fcd9a' 
  AND token = '/+3lQvPLx1w0aMK8l7JSipDSwles0SkdwVSRkrVlLU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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