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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99f5af3e03734c9dad697adce2f154b4b918728e1771fefd6c842534d473464' 
  AND token = 'x2byCcesPZdHWCeyTrSUlgbz1ne3rgsqiNKkOLZ6kR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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