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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b124df51add7371616579d7bad52823a6e43579ee3c4c4145114eff772a3be3' 
  AND token = '2V0RQ2WafcrobiUrvftmh0R6Vf0y/wxoxzGdn+Lkxsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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