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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ddc2e90b605ecee3ed61e9a2ca801ef411a041c4b23afb4be7c88697c5397f' 
  AND token = 'fe6GEweuscscMn/+tW2kl6iXWAXy5S6ADhw5ukb1MSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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