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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde6893c051a4db763c6e50d19665e96e7485949096f3c726ce8b9bbebfc69c8' 
  AND token = 'oWmSpJos5+KaMHMTruHSIQrmB2joXmQDhkzBNfqi0ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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