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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e02ee961170d9429752b6e4048984c0d87ab6195a7e7a61c85568741f7de549' 
  AND token = 'MM4yMauzJS2jmhPPiM3YYDwwGeYz34qX17tbnEWLdu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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