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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677516300c81145018e87709848fecb6896f4be3c43845708840a2ec6444a62a' 
  AND token = 'fJFHZDqua41QawH+B9N0/tkXtX9NvZ7ZN0C8LnSA2aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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