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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d9a22746807373e7a7aa197577da32fb2298c3fb72f32a499aef951c2d5a9f' 
  AND token = '9LQx7F3oRk7dNUO+A+yiS/lQtAMDj6P9cXvyHRn93l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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