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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd3a08cf3346636d602634c2b5f1784072231656bd54eaa41d637227301164c' 
  AND token = '9VRDyhoIqA4Gg7v1MEBQ7dHUunhrBejx/HEC1eZ/tvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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