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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054262ecf93a9b81d9c1612984921a120fea1051df1265bdbda6375161c79e6c' 
  AND token = 'oqLTcTP7X4G7PkkAYxigrgagMRWPs/xrN8xeCLh/r1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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