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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f7c888bb10b9727d8debab67d37b9b8034b415a6637072ff87b0a4e23b7f5e' 
  AND token = 'uuNXe0bZUXHF//J2Gf6l5EhQ+0zV59gHVDiGTnRdULM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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