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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e416a523a2978b658666e1ae766f17a4cb0c47cfbb95ae13f8c01792128b43' 
  AND token = 'JYQ6QVS0wLH8njzSGRXmKVkBqQ0OblpBcib7QeXDbeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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