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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be562be565ccdd0dce6df0a730843ad409d1f78ddfa221731d276211d0d2a4b9' 
  AND token = '1N35Bo9Axk3A2A7Zrh4M6StS1cF7jYA7jNdUXz7eacY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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