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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089ce9c190663bbc3136ce6c529d5c004e7197e89fead962ae25aecd28644c1f' 
  AND token = '7jdRsVc+Nb8ddfsOIbeWnCtHX1OnvhEj42dUvF9IGvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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