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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4615b1303a88dc4c829587e5dc217395dfb18d8ab9dc1f1bb6fd55fb85bc3de8' 
  AND token = 'jsY5MmU1GvV8RiFQfNVd1FTB90mg/dqAGTIsF2Ul3ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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