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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd44bca71021f5a8c558fd08446b61c1db01b5c50a2d488ee61aa5711e918a5' 
  AND token = 'eEmuH1qPn7IDJTyqL7BIsvOWxJd9SwLB22ReEvMcUWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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