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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04bda723a5eb4ea6490787804b6f6e414d01d001dc928581cc759b686fd605d2' 
  AND token = 'szaLltrhm1F16Thl7PBEtimBoQNhkbNTGWXSsBExGWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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