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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1880247b84e3ecdef358317f0ea15f091305b0a3325e4c7ea2d4fed0bd70637' 
  AND token = 'CjMVFFPPr5pILVxz692J3pPfBtXQ9hUtGx0RmhdIrE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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