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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102f5b591f4199e11d13a67a31a74978a00b0ac6ea556df90667ed475528743c' 
  AND token = 'shT+FuHNp/z7CNhtJIhsFhW06xXhT0CNdBaOoFrljJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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