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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6ffe07bff76d71e8faed21ad886f9f64bd25212e7ce23e337c02bfe78aab2c' 
  AND token = 'jDlfGDN0AcXz4+Q6LVz+DFZ9VPX/ow4A02lIwXY7Va4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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