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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93f18aeae3436bc3cddb9195b48643d47dc2ba9887ba03e8fba993a693b2211' 
  AND token = 'cbwv0lm51BvGVCvayv2pYURDpxEIlZQ+jaVLam2SZOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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