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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8b9680a62c17f4a3d60f6c99689f042f539a57e8dca0b0ed39d33ccf68ed8d' 
  AND token = 'AARpSGLox38l6+wANXqUiE8lmoDbMl4YpXuY7K3rsIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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