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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20eedf622963a9f96db95e7ffdcc271807ea547e826112ca8511b57fdbae45d' 
  AND token = 'A4wZnWsY5OPcCUZ/DqNX0oM99a6DV3tRGaSwYAfXb+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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