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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fcabea80e23c51fddf4fe3508ac400ede5f442c5db59ef5eb06e9e4d4c19937' 
  AND token = '9G2Q/gzmLVsmQCFnHTyFQ400rbFYdGcbCxe+Ar2rL+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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