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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd083524ef87612b37483f785ee181c9c0c4f98098bdc273cb8ac5357b8d872' 
  AND token = '+z5y7wZ4Jx0oOh7VSqYcZKMR+TNzu9EGpRpNpYcXrMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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