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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7324191afaf46c18a599f90c3309cc811c5efa26d55d60119a818af13db05a48' 
  AND token = 'rnwY4JhOZ1hUxEEnsBwM3HnM26ht7I0NX+1Vt21u+rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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