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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c210cad545c960fca7d1d7fe170c3ef45eaa040ace6f79366b3e632fa64d5c73' 
  AND token = '0ozxWwceMwomTQ9idl8Z7jJN1GP1FZcUAa8CqTfERfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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