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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e014ca5f71b13e8a04ee9fdae8b3b3582db7c59ebb521d2376173004271cce' 
  AND token = 'h5KfNMTpLPbkaapdC2nes5oZa1AxxMf0LTjxXd6Zqcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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