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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38bcdd974e47cd8bcfb383f6d1027d7a5b80dcef556a20c09f9a61a325488b78' 
  AND token = 'LYquFARWVsXTeBQYDu/UweYTn0DvMcULhTD39x0NJv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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