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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b63483300490226f512a88e30b09fc61687f8509dbfd8f7d4676460fcd3e3c6' 
  AND token = 'Qu6HNxI26RS77aynpKerZ77+/XeRdDe7HE+J3Y08Tjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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