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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be4e3ce0349e49263ec3e21d2282db78d683c07f6f04fc9d7d1be624a49533a' 
  AND token = 'wn5dcMLqpF7Lo7gERzTYs99+68fbtKomnMDjIRXFs6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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