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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c62fb9ea796ef73f090dcb2b74bfcafa028a660a75ed4b7f78f1485d29ef58e' 
  AND token = 'BqGEOYEkw7dQe+hDQCRgdqSMXLycCST0Jxz0objovYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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