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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be9abb0911d24c75fa0924ad5e76ec63a552ad988a85a2aeecc9810d391088f' 
  AND token = 'vUDcGi69Bywp0X+bq18vBAvVCOh8GmUilGD6GP1QW+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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