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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25090e11e7383f63736fa31bd8dca42678a4be666c1004ed28e025bd13b4f976' 
  AND token = 'P90yhzFMxTx49OAnDDAe82K1Q00kU5ICr3ipdI962p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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