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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '466f88682dd3e8c9535fe7b309e9c613ef1f754bb615ec00e2cab0bfe68fa88a' 
  AND token = '2HUJkTSidstkg0LmNzY0R7Iuuw1uGU7JxTpDKH6zN9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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