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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31fb0f99cdb295bb604c0c1ee8c36d2258c31f3379082f5ae408c9333a4b5961' 
  AND token = 'NauWR/ENVGtQAqL8eGewzuBYOk62TH4eca3hlmDhY9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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