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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10cbbd3d72e4978294a23a6df42c791b06815ffbb82c98d72165256204efd74a' 
  AND token = 'ol9vXqEMc59USr+hmrNCr7+qs185XlP7UqM7TF03jIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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