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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31b3f1f1a9fd5d618839dd5a2d70e20756a13bd4c00cedc8b0720350640f72c' 
  AND token = 'CcU79OciQSOK0tixxJPF5ZEfPIcslOhhFfa12ecz7uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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