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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a93bdad83ed978cad6a187d554a978134729c15ccdfed45f30454a29d6f226' 
  AND token = '8jFRbFSPSS3sci7Hr4fefjt/8fvdia7xY6bYzbAOKHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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