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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a71e73b5d180c5e6b6e24a92a9603ade0945b9c66e8a7e601a015cc7da398af' 
  AND token = '1GuLhz1QOP2V5pFuwibMn7poO+jwnxWg/DSZdcONR1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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