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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940a81b3e6b0398646a5e0d8cb98b07da7c8ae56397bff9c1826e8c8677874e5' 
  AND token = 'Nk8rZt0s4M7+iFH43466SiHKcDpJEA1mtatrhge2qrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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