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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093a1cb7e57c399888a0fe70a2189d13992c6be124cfa8f3e3cd3b2b5e1285fe' 
  AND token = 'OjckZk0Mb/9sJATxemsoSywvdkZa81n3Qg2sgI9hnI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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