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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7c828658b7fc95c166c7498dc2d062fd91586d3519c1503c7feddc51b40a70' 
  AND token = 'IUVlrrp7hay1bvCpbnrdJCqYYQbGT45cPlXSG8yUweg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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