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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998ff01e60fa1c10f1f9cec6b566d46f4ca7b9cebbf0147b231aa6e0fa42bfc2' 
  AND token = 'NzD+McrbwSZZ5JVUKo0/qh5UBO02rs5MptqpaGL0GH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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