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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f5295f2f4d1333dfb9f34a07aab84fcde4f7ab4459b94f6f6bb2a0386c3dfe6' 
  AND token = 'l+0/7LiZbZS9DTkLZi9YwHgYo09ZhVVb9kodsj80jBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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