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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9212e30ae83cec002b3ed68b3daa785986138502e7ab359698b5953b48f903a' 
  AND token = '8W2PkuPtBJq5d+Npnnjg+M8wlwb7OKhy2IHedoQOaL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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