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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7fb98a9b68b7e49a05774dd10a048ef90b88a7c4cd7a8cc68a5374b10d93db' 
  AND token = 'GspS2f/gW5TJqW2TzH8zeSe3b9QuOPfYT8SrRHwJkEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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