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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7046c81d6d1694ea4e05d0107388ab019f86a73cf1730fe02c76a9510ff1e553' 
  AND token = '+3g2SPdtKgOcygkyBZLC/6SPhOTpb1PdbGeLpFRieZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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