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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe777cd09217f1fb63588b2832cdf5d7eadfa70da8e18146b324a1045cad5b3' 
  AND token = 'of62Lv27a0LDbpCL418VdxZwpfWSk3pJrXC7MIn8+I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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