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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030c0ae1dfd7fed15f81d91225e201c1a0f3da4a898778f92506139488ce437b' 
  AND token = 'G/VdXeYdtepeOgD1O2wU2s396qSMp/DSbZNL7syboAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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