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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc5b396207a5c7ec32f78e79497a343d92eef25285e3df04167e30faa79c758' 
  AND token = 'nfLNTgN8GmRrW4rFi4NcUr5vVKTaGVHuNS9xQhwm0bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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