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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad482c3610d349c04dba489964ef023374ba9ea5802c8ff6515b6fd263a024a' 
  AND token = 'F9HP90v0nQfM42vSCEa74BL1VdF3Emogw3fAPSr5FUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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