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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ac8776b5fce2b0e4172a3ed898044c6e71e8170ccbb98a77fd7b968c3750bca' 
  AND token = '4DC9+jjt/8MwiufBABrfl/9NFqE3tEot6WxGCPcF+9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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